AirHint found the following cheapest return flights from San Francisco (SFO) to Helsinki (HEL) in August 2025 (see full year).

Return flights

17 Aug - 02 Sep	Turkish Airlines
15 Aug - 24 Aug	Turkish Airlines
05 Aug - 12 Aug	Turkish Airlines
01 Aug - 08 Aug	Air France
04 Aug - 09 Aug	Hawaiian Airlines
02 Aug - 07 Aug	Iberia
02 Aug - 09 Aug	Delta
02 Aug - 08 Aug	Hawaiian Airlines
01 Aug - 09 Aug	Delta
03 Aug - 09 Aug	Frontier Airlines

Also check the deals for one-way flights from San Francisco to Helsinki in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Helsinki

Cheap car rent in Helsinki

Cheapest return flights from San Francisco to Helsinki in August from $664

Return flights